Bird Calibration Carts are designed for immediate, effortless use. It has three primary components. The 4421 Multifunction Power Meter displays RF power. Power Sensors are highly accurate sensors that measure RF power without requiring calibration or external couplers or attenuators. Bird Loads are low reflection 50 Ω terminations that can dissipate 1 kW to 10 kW max., depending on the model. These components are installed on a cart for easy transportation and connected so that the only setup required is connecting AC and RF power. The cart is suitable for use in a clean room environment and is equipped with four swivel casters for maximum maneuverability.